How many movies have Miyuki Sato and Susumu Matsunaga collaborated on?

They have worked on 4 movies together! Their first movie together was Steins;Gate: The Movie - Load Region of Déjà Vu (2013) and was their highest rated movie together. They have not worked together since Pokémon the Movie: Volcanion and the Mechanical Marvel (2016). They are most known for their animation films together.